Sound: The Rike Audio S-Cap seems to be several capacitors all in one: they are very coherent, nothing is over high-lighted, they just do all things right. They are clear but never too bright and open things up nicely without any artificial emphasis on certain parts of the spectrum. They have depth that lets you look deep into the recorded information in a very natural and coherent way, seperating the individual instruments of an orchestra in a very convincing manner. Another thing that the Rike Audio S-Caps do well in making the music sound more realistic is dynamics. Compared to the Jantzen Audio Superior Z-Cap (that is about half the price I must note) they have more flow and are more spatious, in comparison the Superior Z-Cap sounds a bit "in your face". Compared to the Jupiter Condenser VT Stacked Cryo Capacitors (also an aluminium foil with paper capacitor) the S-Caps are more lively and open. They both give a nice "analogue" feel to the music but the Jupiter sounds a bit muffled, more "old school" if you like. Compared to very high-grade copper foil capacitors the Rike Audio S-Cap could do with a little more richness and tonal colour but then we are talking about capacitors that cost far more. In general I consider the Rike Audio S-Cap to be one of the best capacitors I have tested in that it produces acoustic instruments and vocals in a very natural and convincing way, well detailed but never fatiguing. For example an Instanbul Mehmet Sultan 22" ride cymbal sounds like it should: a nice metal "ping" combined with a certain warmth. Piano music comes across very realisticly with a wide dynamic range, full-bodied and open.
A small note on using the Rike Audio S-Cap: if you need to use multiple values in parallel to obtain a certain total value, do this with multiples of the same value. For example if you need 30uF, use 2x 15uF or 3x 10uF instead of something like 22uF + 4,7uF + 3,3uF. I found that if the values are not equal the signature can become a little nervous, when the values are equal the music flows better.